Kiln construction



April 4, 1939. R. E. MINOGUE KILN CONSTRUCTION Filed March 31, 1938 2 Sheets-Sheet 1 INVENTOR. flow/m z? Mwoaa: M fl x)? v ATTORNEY.

April 4, 1939. R. E. MINOGUE KILN CONSTRUCTION 2 Sheefs-Sheet 2 Filed March 51, 1938 INVENTOR. BY flow/mi W/A/OG'flf A ORNEY.

Patented Apr. 4, 1939 UNiTE S ATE OFFECE 11 Claims.

This invention relates to a kiln construction. Objects of this invention are to provide a novel form of means for feeding finely divided material, such as flue dust, to a kiln and is in general an improvement over that disclosed in my prior Patent No. 1,707,191 of March 26, 1929, for Rotary kiln feed.

Further objects are to provide a construction for .a rotary kiln which is so made that it will deliver the finely divided material uniformly to the kiln while the kiln is in continuous operation which prevents the entrance of cold air and in which no valves or other movable flaps or similar parts are employed.

Further objects are to provide a construction which does not restrict the flow of gases from the kiln, in which the velocity of gases leaving the kiln is less than where an obstruction is placed in the end of the kiln for returning flue dust, in which the dust loss is reduced, and which is so made that a smaller annular tail board may be employed.

Further objects are to provide a construction which can be applied to or installed on a standard kiln with a minimum amount of change and which does not embody any elaborate or extensive mechanical construction.

In greater detail, further objects of this invention are to provide a novel construction of feeding means for returning flue dust or other finely divided material to the kiln, in which the device includes two co-related parts, one of which is carried by and revolves with the kiln and the other of which consists of a relatively stationary portion which receives the feeding means for delivering the material to the feeding device, in which self-aligning or relative adjusting of the parts is automatically secured, in which there is no gap or opening in the feeding means through which flue dust may be blown or might escape, and in which spring pressure or yielding pressure is applied at spaced points for maintaining sealing and for permitting relative adjustments to insure an accurate working sealing joint between the revolving portion and the relatively stationary portion.

Further objects are to provide a construction in which the feeding of the material may be obstructions provided in the kiln due to the presence of the feeding means.

An embodiment of the invention is shown in the accompanying drawings in which:

Figure l is a fragmentary side elevation of a 5 portion of a kiln with the feeding means applied thereto.

Figure 2 is an enlarged transverse sectional view through the construction illustrated in Figure 1 with various portions broken out to show 10 successive parts of the feeding means, such view corresponding approximately to a section on the line 2-2 of Figure 3.

Figure 3 is a view showing the feeding means in section along the line 3-3 of Figure 2 and 15 showing the kiln in full lines.

Figure 4 is a developed top view of a portion of Figure 2.

Figure 5 is a fragmentary detail corresponding to a section on the line 5--5 of Figure 2.

Referring to the drawings, it will be seen that the kiln is indicated by the reference character I and it may be a cement kiln or any other type of rotary kiln. It is provided with the usual refractory lining 2, see Figure 2.

The feeding means comprises two cooperating parts, one of which indicated at A in Figures 1, 2 and 3 is rigidly secured to and carried by the kiln. The other cooperating part is indicated at B, see Figures 1 and 3, and is relatively stationary.

The member B is an annular closed compartment having a radially spaced inner and an outer wall 3 and 4 and an end wall 5 and inner wall 5', see Figure 3. The reason for forming the box like structure for the member B is to secure stiffness. This member B is supported by means of axles 6, see Figure l, projecting from diametrically opposed points on the member and carrying supporting flanged wheels I which ride upon stao tionary tracks 8, the tracks preferably having upturned ends. These tracks are supported from stationary frame work 9. Spring pressed plungers iii are provided and bear against diametrically opposed points of the member B and 5 urge the member 13 into sealing engagement with the member A. The plungers I0 may be urged to the right, as shown in Figure 1, by means of springs 52 which bear against supports I3 which carry the plungers. The member B may thus adjust itself to the member A and maintain a sealing engagement with such member, irrespective of minor misalignments or slight angular variations in the relative axes of the kiln and of the member A.

The member B is provided with wearing rings M which bear against the wearing rings l5 carried by the member A. A feed pipe or feeding means 16, see Figure 1, leads through the member B and delivers the flue dust or other finely divided material. It is provided with an angularly set spout or delivery chute I! which projects into the annular compartment l8 of the member A. The stream of incoming material thus passes through the member B and is pro- J'ected into the member A.

The member A has an inner wall [9 and an outer wall 20 and an end wall 2|. It is thus an annular hollow member. It is divided into two sections by means of the radially extending partition 22, and the forward section is further subdivided by means of an annular wall 23 and a small radially extending wall 24, as most clearly shown in Figure 3.

Between the inner annular wall l 9 and the intermediate annular wall 23 a plurality of angularly set vanes 25 are provided and at regular intervals a relatively larger angularly set vane 26 is provided, as shown in Figures 2 and 4. The vanes 25 extend part way towards the partition 22, see Figures 3 and 4, while the vanes 26 extend completely across to the partition 22.

As shown in Figures 2, 3 and 5, apertures 21 are formed in the partition 22 and thus the material which is discharged from the spout or chute H, see Figure 1, falls onto the upwardly traveling, inwardly directed angular vanes and is consequently directed inwardly towards the wall 22, the larger vanes 26 collecting the material and directing it through the openings 2! into the compartment 28 formed between the partitions 22 and 2 i, see Figures 3 and 5.

Scoop like vanes 29, see Figures 2 and 3, are provided in the compartment 28 and extend towards the direction of rotation of the kiln, as in- "dicated in Figure 2. As the kiln rotates, the scoop like vanes 29 gather up the material in the chamber 28 and pass such material into the chutes or passageways 30 leading into the kiln.

For the sake of simplicity of showing only two of such scoop like vanes and inlet apertures 30 have been shown, but it is to beunderstood that the invention contemplates a plurality of such parts to insure a relatively uniform distribution of the incoming material. As many of these scoop like vanes and inlet apertures may be employed as desired.

Some small part of the flue dust discharged from the chute or spout I! may fall into the compartment [8, although the major part of it will be caught and guided by the vanes 25 and 26. Such material as does fall into the annular compartment I8 is picked up by the small angularly set vanes 31 located in the compartment I8 and guided through apertures 32 into the compartment 33, see Figures 2 and 3. The compartment 33 is formed between the outer annular wall 20 and the intermediate annular wall 23. This compartm'ent 33 is provided with vanes 34 which are angularly set and which guide material to the apertures 35, where such material will discharge onto the vane 26 and then into the compartment 28.

It is to be noted from reference to Figure 4 that the apertures 35 are formed inwardly so as to discharge the material from the apertures to a position closely adjacent the radial wall 22 and guard against any possibility of its falling outwardly back into the compartment I 8.

It will be seen that a novel continuous feeding means has been provided which does not allow the entrance of cold air into the kiln or the escape of gases from the kiln, which does not require any valves or other movable parts, and which is relatively simple and is easily applied to kilns. 5

It is to be noted also that the members A and B will always be in alignment or, in other words, automatic relative adjustment may take place between such members so as to maintain the seal between the members. Further it is to be noted 10 that the bore of the kiln is not restricted and consequently the velocity of gases through the kiln is not increased, the operation of the apparatus functioning without disturbing any normal functioning of the kiln and without permitting the 5 loss of flue dust or other finely divided material that may be returned or delivered to the kiln.

Although this invention has been described in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

I claim:

1. The combination of a rotary kiln having a passage therethrough for hot gases, feeding means for feeding finely divided material to said kiln, said feeding means comprising twocooperating parts, one of said parts comprising a first annular member secured to and carried by said kiln and surrounding the external peripheral portion of said kiln and providing a chamber open only on one side, said chamber being distinct and separate from the passage through said kiln, said annular member having at least one passage opening into said kiln, the other of said parts comprising a second annular member separate from said kiln and closing the open side of said first annular member, means holding said second annular member in contact with said first annular member, and feeding means leading through said second annular member into the chamber of said first annular member.

2. The combination of a rotary kiln having a passage therethrough for hot gases, feeding means for feeding finely divided material to said kiln, said feeding means comprising two cooperating parts, one of said parts comprising a first annular member secured to and carried by said kiln and surrounding the external peripheral portion of said kiln and providing a chamber open only on one side, said chamber being distinct and separate from the passage through said kiln, said annular member having at least one passage opening into said kiln, the other of said .parts comprising a second annular member separate from said kiln and closing the open side of said first annular member, means holding said second annular member in contact with said first annular member, feeding means leading through said second annular member into the chamber of said first annular member, and means for receiving material fed by said feeding means and progressively passing such material through said first annular member and into said kiln.

3. The combination of a rotary kiln having a passage therethrough for hot gases, feeding means for feeding finely divided material to said kiln, said feeding means comprising two cooperating parts, one of said parts comprising a first annular member secured to and carried by said v0 kiln and surrounding the external peripheral portion of said kiln and providing a chamber open only on one side, said chamber being distinct and separate from the passage through said kiln, said v annular member having at least one passage 76 opening into said kiln, the other of said parts comprising a second annular member separate from said kiln and closing the open side of said first annular member, means holding said second annular member in contact with said first annular member, feeding means leading through said second annular member into the chamber of said first annular member, and means within and carried by sa d first annular member for guiding and directing material fed by said feeding means into said kiln.

4. The combination of a rotary kiln having a passage therethrough for hot gases, feeding means for feeding finely divided material tosaid kiln, said feeding means comprising two cooperating partsyone of said parts comprising a first annular member secured to and carried by said kiln and surrounding the external peripheral portion of said kiln and providing a chamber open only on one side, said chamber being distinct and separate from the passage through said kiln, said annular member having at least one passage opening into said kiln, the other of said parts comprising a second annular member separate from said kiln and closing the open side of said first annular member, means holding said second annular member in contact with said first annular member, feeding means leading through said second annular member into the chamber of said first annular member, and means including a plurality of angularly arranged vanes located within the chamber of said first annular member for directing material fed by said feeding means into said kiln.

5. The combination of a rotary kiln, feeding means for feeding finely divided material to said kiln, said feeding means comprising two cooperating parts, one of said parts comprising a first annular member secured to and carried by said kiln and providing a chamber open only on one side, the other of said parts comprising a second annular member separate from said kiln and closing the open side of said first annular member, means holding said second annular member in contact with said first annular member, feeding means leading through said second annular member into the chamber of said first annular member, said first annular member having successively spaced annular compartments, one. of said annular compartments having a plurality of angularly arranged vanes therein for receiving the material fed from, said feeding means and for directing such material towards said second annular compartment, said first annular member having apertures leading from one annular compartment into the other annular compartment, the other of said annular compartments having means adapted to scoop up material, and said kiln having means for conducting the scooped up material from the other of said annular compartments into said kiln as said kiln rotates.

6. The combination of a rotary kiln, feeding means for feeding finely divided material to said kiln, said feeding means comprising two cooperating parts, one of said parts comprising a first annular member secured to and carried by said kiln and providing a chamber open only on one side, said annular member having at least one passage opening into said kiln, the other of said parts comprising a second annular member separate from said kiln and closing the open side of said first annular member, means holding said second annular member in contact with said first annular member, feeding means leading to the chamber of said first annular member, means ineluding a plurality of angularly arranged vanes located within the chamber of said first annular member for directing material fed by said feeding means into said kiln, and auxiliary means for collecting any material that may escape the vanes and delivering such material into said kiln.

'7. The combination of a rotary kiln, feeding means for feeding finely divided material into said kiln comprising two component parts, one of said component parts being a rotary member rotating with and carried by said kiln and peripherally surrounding said kiln and having a chamber provided with an opening extending axially of said kiln, the other of said component parts being relatively stationary and closing the opening of said chamber, a feed pipe extending from said relatively stationary part to said rotary member, means carried by said rotary member for receiving material from said feed pipe and for directing the material axially away from said feed pipe, and scoop like means for gathering up material from said first mentioned means and for conducting the material into the kiln.

8. The combination of a rotary kiln, feeding means for directing finely divided material into said kiln comprising two component parts one of which is a relatively stationary annular member and the other of which is a rotary annular member carried by the kiln and rotating with the kiln, a feed pipe extending from the relatively stationary member to said rotary member, a plurality of vanes carried by said rotary member for receiving material from said feed pipe and for directing material axially of said kiln away from said feed pipe, a plurality of scoop like means for gathering up the material from said vanes and for conducting the material into the kiln, and an intermediate compartment carried by said rotary member and communicating with said scoop like means, and means for gathering up material that escapes said vanes and for delivering the gathered material to the intermediate compartment.

9. The combination of a rotary kiln, feeding means for feeding material into said kiln, said feeding means comprising a first annular member mounted directly on said kiln and rotating with said kiln and a second relatively stationary annular member, said first annular member being hollow and having a substantially annular compartment, a feed pipe extending through said second annular member into the compartment of said first annular member and having a spout directed towards and overhanging a portion of said first annular member, main feed receiving and shifting means carried within said first annular member for receiving material directly from said spout and shifting said material axially with respect to said kiln away from said spout, auxiliary shifting means for picking up material escaping the first shifting means and for directing said material axially of said kiln away from said spout, and means for gathering the shifted material and forconducting it into said kiln while said kiln rotates.

10. The combination of a rotary kiln, feeding means for feeding material into said kiln, said feeding means comprising a first annular member mounted directly on said kiln and rotating with said kiln and a second relatively stationary annular member, said first annular member being hollow and having a substantially annular compartment, a feed pipe extending through said second annular member into the compartment of said first annular member and having a spout directed towards and overhanging a portion of said first annular member, main feed receiving and shifting means carried within said first annular member for receiving material directly from said spout and shifting said material axially with respect to said kiln away from said spout, auxiliary shifting means for picking up material escaping the first shifting means and for directing said material axially of said kiln away from said spout, and means for gathering the shifted material and for conducting it into said kiln while said kiln rotates, said main feed receiving and shifting means being spaced radially inwardly of said auxiliary shifting means.

11. The combination of a rotary kiln, feeding means for feeding finely divided material to said kiln, said feeding means comprising two cooperating parts, one of said parts comprising 'anfirst annular member secured to and carried bysaid kiln and providing a chamber open only on one side, said annular member having at leastorie passage opening into said kiln, the other of said parts comprising a second annular member sepa rate from said kiln and closing the open side of said first annular member, means for adju'stably holding said second annular member, yielding means urging said adjustably held second annular member into contact with said first annular member, feeding means leading into the chamber of said first annular member, and means Within and carried by said first annular member for guiding and directing material fedby said feeding means into said kiln.

ROLAND E. MINOGUE. 

